A double-kaonic nuclear system, K~-K~- pp, to be formed in pp collisions

摘要

Based on the idea that the simplest double-K nuclear cluster, K~-K~- pp, can be produced in the p + p→ K~+ + K~+ + Λ~* + Λ~* → K~+ + K~+ + K~-K~- pp reaction, where Λ~* = Λ(1405) is a quasi-bound state K~_p, we have calculated the differential cross sections for this process and found out that a peak of K~-K~- pp dominates in themass spectrum when the cluster is a deeply bound and dense system, helped by a very large momentum transfer Q ～ 1.8MeV/c. The appropriate incident proton energy for this process is around 7GeV.We found that, the deeper and denser the bound system is, the larger its population becomes. The K?-K? repulsion inside K~-K~- pp is shown to give only a small change on the bound-state structure and the cross section.